KI/H₂O₂-mediated 2-sulfonylation of 1H-indole and arylsulfonyl hydrazides^a.

^aReaction conditions: 1a (0.5 mmol), 2 (1.0 mmol), KI (1 equiv.), H₂O₂ (1 mL), reaction time 5 min. The yields of isolated products are given.